CVE-2026-33693

CVE-2026-33693: SSRF mediante bypass de 0.0.0.0 en v4isinvalid de activitypub-federation-rust CVSS 6.5 Moderado Palabras clave: SSRF, 0.0.0.0, bypass de validación de IP, activitypub-federation, Lemmy, Rust, ActivityPub Tabla de contenidos Descripción general Detalles de la vulnerabilidad Análisi...

cve-2026-47777

CVE-2026-47777 — Mastodon Featured Collections 授权绕过 概述 我负责任地披露了一个影响 Mastodon 实验性 Featured Collections 联邦管道的高危授权绕过 漏洞。 CVE ID： CVE-2026-47777 受影响组件 ActivityPub::VerifyFeaturedItemService 弱点 CWE-345 — 数据真实性验证不足 CWE-863 — 授权不正确 CVSS v3.1 分数| 向量 ---|--- 7.5（高危）|...

CVE-2026-90679

A flaw was found in Forgejo when federation is enabled. This issue allows a remote attacker to spoof identities by submitting signature-valid ActivityPub activities attributed to any actor identity. The system fails to verify that the HTTP Signature on an incoming ActivityPub activity was produce...

CVE-2026-90679

Forgejo 13.0.0 through 16.0.4, when "federation ENABLED = true" is set, has a spoofing issue that affects identity integrity but does not allow account takeover or content modification. It does not verify that the HTTP Signature on an incoming ActivityPub activity was produced by the key belongin...

CVE-2026-90679

Forgejo 13.0.0 through 16.0.4, when "federation ENABLED = true" is set, has a spoofing issue that affects identity integrity but does not allow account takeover or content modification. It does not verify that the HTTP Signature on an incoming ActivityPub activity was produced by the key belongin...

CVE-2026-90679

Forgejo 13.0.0 through 16.0.4 with [federation] ENABLED = true contains a signature-spoofing flaw in its ActivityPub inbox processing. The HTTP Signature verification in routers/api/v1/activitypub/reqsignature.go validates the request, but inbox handlers then read the acting identity from the att...

EUVD-2026-76944

Forgejo 13.0.0 through 16.0.4, when "federation ENABLED = true" is set, has a spoofing issue that affects identity integrity but does not allow account takeover or content modification. It does not verify that the HTTP Signature on an incoming ActivityPub activity was produced by the key belongin...

PT-2026-90787

Forgejo 13.0.0 through 16.0.4, when "federation ENABLED = true" is set, has a spoofing issue that affects identity integrity but does not allow account takeover or content modification. It does not verify that the HTTP Signature on an incoming ActivityPub activity was produced by the key belongin...

CVE-2026-86112

BookWyrm through 0.9.1 fails to validate user visibility permissions in the Favorite and Unfavorite views, allowing authenticated attackers to favorite or unfavorite followers-only and direct statuses they cannot access. Attackers can POST to the favorite endpoint with a status ID to create...

CVE-2026-86112

BookWyrm through version 0.9.1 contains an authorization flaw in its Favorite and Unfavorite views (located in interaction.py). The endpoint fails to validate user visibility permissions, allowing authenticated attackers to POST a status ID to the favorite endpoint and create unauthorized interac...

CVE-2026-86112 BookWyrm through 0.9.1 Missing Authorization on the Favorite and Unfavorite Endpoints

BookWyrm through 0.9.1 fails to validate user visibility permissions in the Favorite and Unfavorite views, allowing authenticated attackers to favorite or unfavorite followers-only and direct statuses they cannot access. Attackers can POST to the favorite endpoint with a status ID to create...

CVE-2026-86112 BookWyrm through 0.9.1 Missing Authorization on the Favorite and Unfavorite Endpoints

BookWyrm through 0.9.1 fails to validate user visibility permissions in the Favorite and Unfavorite views, allowing authenticated attackers to favorite or unfavorite followers-only and direct statuses they cannot access. Attackers can POST to the favorite endpoint with a status ID to create...

EUVD-2026-71944

BookWyrm through 0.9.1 fails to validate user visibility permissions in the Favorite and Unfavorite views, allowing authenticated attackers to favorite or unfavorite followers-only and direct statuses they cannot access. Attackers can POST to the favorite endpoint with a status ID to create...

CVE-2026-52769 YesWiki: Unauthenticated Server-Side Request Forgery via ActivityPub `Signature.keyId`

YesWiki is a wiki system written in PHP. From version 4.6.2 to before version 4.6.6, the POST /api/forms/formId/actor/inbox route - exposed publicly with acl:"public" - accepts an HTTP Signature header whose keyId parameter is a URL. HttpSignatureService::verifySignature parses the header and...

CVE-2026-52769

YesWiki (PHP wiki system) versions 4.6.2 through before 4.6.6 contain an unauthenticated Server-Side Request Forgery (SSRF) in the ActivityPub inbox endpoint. The route POST /api/forms/{formId}/actor/inbox (public ACL) passes the attacker-controlled keyId URL from the HTTP Signature header direct...

CVE-2026-52769 YesWiki: Unauthenticated Server-Side Request Forgery via ActivityPub `Signature.keyId`

YesWiki is a wiki system written in PHP. From version 4.6.2 to before version 4.6.6, the POST /api/forms/formId/actor/inbox route - exposed publicly with acl:"public" - accepts an HTTP Signature header whose keyId parameter is a URL. HttpSignatureService::verifySignature parses the header and...

CVE-2026-52767 YesWiki: Unauthenticated ActivityPub Signature-Verification Bypass via `!openssl_verify(...)` accepting `int(-1)`

YesWiki is a wiki system written in PHP. From version 4.6.2 to before version 4.6.6, HttpSignatureService::verifySignature checks the result of PHP's opensslverify with a loose boolean negation - if !opensslverify... throw ... . PHP's opensslverify has four possible return values: 1, 0, -1, and...

CVE-2026-52767 YesWiki: Unauthenticated ActivityPub Signature-Verification Bypass via `!openssl_verify(...)` accepting `int(-1)`

YesWiki is a wiki system written in PHP. From version 4.6.2 to before version 4.6.6, HttpSignatureService::verifySignature checks the result of PHP's opensslverify with a loose boolean negation - if !opensslverify... throw ... . PHP's opensslverify has four possible return values: 1, 0, -1, and...

CVE-2026-52767

YesWiki versions 4.6.2 through 4.6.5 are affected by a signature-verification bypass in the ActivityPub implementation. The vulnerable function HttpSignatureService::verifySignature() in tools/bazar/services/HttpSignatureService.php uses a loose boolean negation on PHP's openssl_verify(). When op...

CVE-2026-54740

Lemmy is a link aggregator and forum for the fediverse. Prior to 0.19.19 and 1.0.0-alpha.18, a lower-ranked remote moderator can remove a higher-ranked moderator by sending a signed ActivityPub Remove activity to the target instance. The local API uses LocalUser::ishighermodoradmincheck to enforc...